As long as the numerical range is not out of bounds, Uchar to char can be assigned directly. They are all 1 byte integers, one unsigned and the other signed.

For example:

Unsigned char t 1=0, t2 = 40.

char c 1，C2；

c 1 = t 1-40；

C2 = T2-40；

printf("%d %d\n "，c 1，C2)；